Penn Grade 1® High Performance Oils The term “100% Pure Pennsylvania Grade Crude Oil” has long carried with it an industry connotation for being one of the best sources of high quality lubricant base stocks in the world. Our BRAD PENN® refinery, the oldest continuously operating lube oil refinery in the United States, still refines 100% Pennsylvania grade crude oil. PA grade crude oil is a very thermally stable paraffinic crude oil which contains no asphaltic constituents. This makes it an ideal choice from which to refine premium quality base oils.Because we use only one crude stock, our refined products are of consistently high quality and performance.BRAD PENN® brand products are truly “MADE IN THE U.S.A.” American Refining Group’s Bradford, PA refinery is the home of “The Green Oil®” that racers, engine builders and enthusiasts alike have all come to know and love! The unique green color and outstanding performance of our Penn Grade 1 High Performance Oils set them apart from the competition.